Thiem looked in good form from the off and once he got his break in the sixth it looked certain that he would go on to take the first set, and he did just that. Of course I was a little bit tight and nervous the previous days'.
Bulgarian tennis player Grigor Dimitrov eliminated French Stephane Robert from the French Open first round here on Sunday.
"It's great. I'm so happy".
"I played really well; won three or four matches". No, I think this year I played all the big events basically, and how many 250s I think I played, three, so that's not a lot. I like the clay. Of course last year I got exhausted at the end of the year, but it was also the first time for me.
Nineteenth seed Albert Ramos-Vinolas, who has had an impressive clay-court season, came from a set down to beat Marius Copil while 38-year-old Ivo Karlovic made experience count against 18-year-old Stefanos Tsitsipas, winning 7-6 (7/5) 7-5 6-4.
Third seed Stan Wawrinka will not start his tournament until Tuesday but arrived in Paris in buoyant mood on Sunday after successfully defending his Geneva Open title at home in Switzerland.
"I'm not quite there near him at this moment but hopefully one day in a few years I can improve on this surface and there's been positive signs this year", he said.
When told about Tomic's remarks about avoiding rallying with him, Thiem said: "It's good to hear this from such a good player like him". It really had a negative impact on my confidence.
"Playing well, winning matches is great, but when you don't win matches it's very hard to get the confidence". And of course, when I'm over 30, I won't play that many again, but I'm young and I'm fresh, so I think there is no problem.
However, Thiem is realistic about their chances and still expects Nadal to be the strongest contender, while he was quick to talk up Novak Djokovic and Andy Murray.